Colorado law says “The driver of a motor vehicle, when reasonably necessary to ensure safe operation, shall give audible warning with the horn but shall not otherwise use such horn when upon a highway.”

“Excuse me: Am I under arrest? Are you going to write me a ticket? Then do it. I’m a busy person and I don’t have time for you to get upset because your actions are creating a hindrance on the road. I have a recording of this incident which I will happily present to the judge. Write the ticket or let me go.”